sensor

[sen-sawr, -ser]
noun
1.
a mechanical device sensitive to light, temperature, radiation level, or the like, that transmits a signal to a measuring or control instrument.

Origin:
1925–30; sense + -or2

censer, censor, censure, sensor.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
sensor (ˈsɛnsə)
 
n
anything, such as a photoelectric cell, that receives a signal or stimulus and responds to it
 
[C19: from Latin sēnsus perceived, from sentīre to observe]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

sensor
1958, from an adj. first recorded 1865, shortened from sensory (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sensor sen·sor (sěn'sər, -sôr')
n.

  1. A device, such as a photoelectric cell, that receives and responds to a signal or stimulus.

  2. See sense organ.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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FOLDOC
Computing Dictionary

sensor definition

hardware
An electronic device used to measure a physical quantity such as temperature, pressure or loudness and convert it into an electronic signal of some kind (e.g a voltage). Sensors are normally components of some larger electronic system such as a computer control and/or measurement system.
Analog sensors most often produce a voltage proportional to the measured quantity. The signal must be converted to digital form with a ADC before the CPU can process it.
Digital sensors most often use serial communication such as EIA-232 to return information directly to the controller or computer through a serial port.
(1997-04-15)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
When darkness falls, a built-in sensor turns on the lights, which glow for up
  to eight hours.
Test takers' digital fingerprints, recorded by a sensor before the examination,
  are kept in an electronic database.
Apparently the sensor in them is probably faulty, but only if it came from one
  of their several suppliers.
Attached to one end was an electronic device containing a sensor and a
  transmitter.
Image for sensor
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